Ok, so running into an interesting situation here.
Buddy of mine has a 11700K based system with a 3070 and 16GB of RAM. We enjoy playing a Clancy title together and were discussing enabling (or not) BAR. In his case, when he is enabling it RAM use is going from ~10GB to upwards of 14 and thus starts other issue related to a lack of available system RAM and page file. Turn it off and goes right back to 10-11 for the same settings.
I am a bit confuddled about it and don't know what to suggest other than leaving it off. To be fair, don't even know if the title utilizes it but in my own PC I just turned it on and left it without any issue so far.